The Trump administration filed suit Thursday against the largest federal union that represents government employees in what it describes as an "affirmative" effort to invalidate collective bargaining contracts as President Donald Trump hopes to bolster his legal standing in laying off thousands of federal workers.

President Trump said he had a productive conversation with Canadian Prime Minister Mark Carney as concerns persist over a tariff war. CBS News' Aaron Navarro reports.

Canadian Prime Minister Mark Carney told President Donald Trump Wednesday that his nation will retaliate against the United States with tariffs of its own if Trump presses forward with his promised levies – potentially escalating what is already developing into an ugly and damaging trade war.

Beyond the economic threats, Trump has repeatedly antagonized and belittled historic partners, notably the one with which the U.S. shares a 5,500-mile (8,900-kilometer) border. He has threatened Canada’s sovereignty, saying it should become the country’s 51st state, and repeatedly labeled its prime minister “governor.”

President Donald Trump says protecting national security gives him the authority to end collective bargaining with labor unions across most of the federal government. JD Vance and his wife are

Canadian Prime Minister Mark Carney officially broke things off with the United States Thursday, marking a seismic shift in relations between the longtime allies. “The old relationship we had with the United States based on deepening integration of our economies and tight security and military cooperation is over,